Really hard to estimate. Fan leaves are basically worthless, and can actually get you less end product.
If your trying to sell it, you might want to make dry ice hash and then smoosh it into disks with a pollen press. It's easy and non-messy to make, and looks a little prettier than other methods.
When your making it, keep raking it into piles and keep the piles in order and don't mix them. The more you shake, the lower the grade of hash will come out, until it's basically leaf dust - by keeping it separate you can toss the piles that are shitty, or mix X amount of shitty hash with X amount of good hash to yield a larger amount of mid-grade.